On Instagram, she posted a photo of the British monarch with the caption, "Refresh your lipstick and pour yourself a drink. Gaslit finale tonight."
Hundreds of people, including Jennifer Aniston, reacted to Julia Roberts' Instagram announcement featuring the Queen.
"Gaslit", a political thriller starring Sean Penn and Julia, is a modern take on the 1970s political Watergate scandal that focuses on untold stories and forgotten characters of the time.